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drm/i915: Don't get hw state from DVO chip unless DVO is enabled

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Certain DVO chips (ns2501 for example) don't like to be accessed unless
the PLL is running. Simply skip the DVO get_hw_state if the DVO port
is disabled.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-06-05 19:15:52 +03:00 committed by Daniel Vetter
parent e0f0273eb9
commit f417c11b89
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/intel_dvo.c
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@ -112,7 +112,15 @@ static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
u32 tmp;
tmp = I915_READ(intel_dvo->dev.dvo_reg);
if (!(tmp & DVO_ENABLE))
return false;
return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
}